fix: support Anchor 0.32+ by defining LAMPORTS_PER_SOL constant

[0x-pankaj]

Problem

Compilation fails with Anchor 0.32+ due to the removal of the native_token module:

error[E0432]: unresolved import `anchor_lang::solana_program::native_token`
 --> programs/gpl_session/src/lib.rs:1:47
  |
1 | use anchor_lang::{prelude::*, solana_program::native_token::LAMPORTS_PER_SOL, system_program};
  |                                               ^^^^^^^^^^^^ could not find `native_token` in `solana_program`

This breaks compatibility for all users attempting to build with Anchor 0.32.1 or higher.

Solution

Removed the import of LAMPORTS_PER_SOL from solana_program::native_token and defined it as a constant directly in the code:

const LAMPORTS_PER_SOL: u64 = 1_000_000_000;

This approach:

• ✅ Works with all Anchor versions (0.28 - 0.32+)
• ✅ Has no runtime impact (constant is inlined at compile time)
• ✅ Is safe because LAMPORTS_PER_SOL is a Solana protocol constant that will never change
• ✅ Maintains backward compatibility

Before & After Screenshots

BEFORE:

use anchor_lang::{prelude::*, solana_program::native_token::LAMPORTS_PER_SOL, system_program};

Result: ❌ Compilation error with Anchor 0.32+

AFTER:

use anchor_lang::{prelude::*, system_program};

const LAMPORTS_PER_SOL: u64 = 1_000_000_000;

Result: ✅ Compiles successfully with all Anchor versions

Other changes (e.g. bug fixes, small refactors)

None - this is a minimal focused fix affecting only the import statement.

Deploy Notes

No deployment changes required. This is purely a compilation fix with no runtime behavioral changes.

New scripts: None

New dependencies: None

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Status	Type	⚠️ Core Change	Issue
Ready	Bug	No	N/A

Summary by CodeRabbit

• Chores
  • Updated internal constant management with no changes to public functionality or behavior.

[coderabbitai]

Walkthrough

A local constant definition replaces an external import of LAMPORTS_PER_SOL in the GPL session library. The value remains unchanged at 1,000,000,000 and there are no modifications to public APIs or control flow.

Changes

Cohort / File(s)	Summary
Import refactoring programs/gpl_session/src/lib.rs	Removed external import of LAMPORTS_PER_SOL from solana_program::native_token and replaced with local constant definition having the same value.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: supporting Anchor 0.32+ by defining a local LAMPORTS_PER_SOL constant to replace a removed import.
Description check	✅ Passed	The description comprehensively covers the problem, solution, before/after examples, and deployment notes, following the repository template structure.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: ASSERTIVE

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between e17bf31 and 6ddff55.

📒 Files selected for processing (1)

• programs/gpl_session/src/lib.rs (1 hunks)

🔇 Additional comments (2)

programs/gpl_session/src/lib.rs (2)

1-1: LGTM! Import statement correctly updated.

The removal of solana_program::native_token::LAMPORTS_PER_SOL from the import statement resolves the compilation error with Anchor 0.32+ while maintaining all necessary imports.

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5-5: Constant definition verified—no further action needed.

The constant value 1_000_000_000 correctly matches the official Solana definition where 1 SOL equals 1,000,000,000 lamports. The shell script search confirms this is the only file with this constant, and no other files in the codebase import the deprecated solana_program::native_token module. The implementation is correct and complete.

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